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Old 07-12-2013, 09:51 AM   #1
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Tire Manufacturer claims 10% load reduction for every 10 MPH over 65 MPH

I am posting this as a new thread as I thought it had such a general application, everyone should see this info.

Please look at page 2 of this thread:
any experience with taskmaster radial flyer trailer tires?

In it you will see a direct response from Maxxis, a leading tire manufacturer, to a dealer inquiry about their speed rating on tires.

The general take away from their post is that you need to deduct 10% from the max load carrying capacity stated on a tire for every 10 MPH over 65 MPH. In other words, at 76MPH you tires are only capable of 80% of their load carrying capacity.
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Old 07-12-2013, 10:03 AM   #2
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I just wonder if that formula can be applied to all ST tires. Maxxis is considered by many to be one of the best manufacturers of trailer tires. When they make that claim, I'm sure they are speaking of their tires in particular. For many of us, our original tires are cheap Chinese tires that only got on our trailers by virtue of the fact they were the lowest bidder.

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Old 07-12-2013, 10:14 AM   #3
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Originally Posted by w4drr View Post
I just wonder if that formula can be applied to all ST tires. Maxxis is considered by many to be one of the best manufacturers of trailer tires. When they make that claim, I'm sure they are speaking of their tires in particular. For many of us, our original tires are cheap Chinese tires that only got on our trailers by virtue of the fact they were the lowest bidder.

Bob

So far in my research I have found 4 tire manufactures that claim (directly or indirectly) a speed rating higher than 65 mph. At this point I think the safe interpretation is that any ST trailer service tire rated for speed higher than 65 should use this formula to find load capacity above 65 MPH.
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Old 07-12-2013, 10:31 AM   #4
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This makes perfect sense.

Goodyear increases Speed Rating by adding otherwise unnecessary air pressure (above that required for the load - short of max sidewall and rim pressure).

Sort of looking at the same issue from the other direction.
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Old 07-12-2013, 10:31 AM   #5
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I generally play it safe and hold my speed to 65 anyway. And something to remember, in many states the speed limit for towing is sometimes less than the posted limit. Typical is 55 MPH, but I don't think that limit is actively enforced. Right off hand, I have never heard of anyone getting busted for going over the towing limit, but still at, or below, the posted limit.

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Old 07-12-2013, 10:51 AM   #6
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Originally Posted by herk7769 View Post
This makes perfect sense.

Goodyear increases Speed Rating by adding otherwise unnecessary air pressure (above that required for the load - short of max sidewall and rim pressure).

Sort of looking at the same issue from the other direction.
What is interesting to me is that Goodyear is advocating raising tire pressure 10 psi ABOVE the max posted on the tire, while Maxxis is stating you should NEVER go above the "MAX" psi.

In other words, Goodyear is saying it is OK to go to 75 psi on a 65 psi tire, which may not be OK on other brands.

Well, at least it is simple and straightforward...
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Old 07-12-2013, 11:12 AM   #7
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Quote:
Originally Posted by jeeplj8 View Post
What is interesting to me is that Goodyear is advocating raising tire pressure 10 psi ABOVE the max posted on the tire, while Maxxis is stating you should NEVER go above the "MAX" psi.

In other words, Goodyear is saying it is OK to go to 75 psi on a 65 psi tire, which may not be OK on other brands.
I have never read Goodyear's words that way, but you're not the first that I've seen interpret them that way. I got the impression that you shouldn't exceed the tire's sidewall maximum pressure nor the wheel's maximum pressure.

The only way to achieve the higher speed rating is if you look at the load table and adjust the pressure according to your load. For instance, my load on a load range E Maxxis tire is 65psi required. Since my tire + wheel can support up to 80 psi, I can safely go to 75psi on the tire and drive up to 75mph without exceeding any ratings.

Maybe I'm misinterpreting it.
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Old 07-12-2013, 11:15 AM   #8
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Too confusing for my feeble mind. I'll stay with 65psi and 65 mph max.
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Old 07-12-2013, 11:20 AM   #9
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Too confusing for my feeble mind. I'll stay with 65psi and 65 mph max.
LOL- true that. I'll stick with 80psi and 65mph max, too.

But, I like knowing that there's a margin for adjustment there if I need it for some reason.
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Old 07-12-2013, 11:25 AM   #10
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I think for a short distance(1.0 -2.0 miles), getting above 65mph is not going to harm anything, sustained speeds in excess of 65mph will no doubt do irreparable damage that will appear later. JMO.
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